GB1449243A - Electric timer - Google Patents
Electric timerInfo
- Publication number
- GB1449243A GB1449243A GB4228773A GB4228773A GB1449243A GB 1449243 A GB1449243 A GB 1449243A GB 4228773 A GB4228773 A GB 4228773A GB 4228773 A GB4228773 A GB 4228773A GB 1449243 A GB1449243 A GB 1449243A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- scr
- pulses
- capacitor
- pulse generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/292—Modifications for introducing a time delay before switching in thyristor, unijunction transistor or programmable unijunction transistor switches
Landscapes
- Electronic Switches (AREA)
Abstract
1449243 Semiconductor time delay circuits CANADIAN GENERAL ELECTRIC CO Ltd 7 Sept 1973 42287/73 Heading H3T A time delay switch Fig. 4 in which a capacitor 13 is charged by an F.E.T. 18 has the obtainable delay increased by using pulses to charge the capacitor. A variable width and for frequency pulse generator 19 controls the F.E.T. 18. The pulse generator 19 operates F.E.T. 18 to correct constant current source T25 (or constant voltage source, R45 Fig. 5 not shown) intermittently to C13. Optional switch 44, operated also by the pulses from 19, is indicated to isolate C13 from unijunction 27 emitter E to reduce leakage during long time delays. When C13 is charged high enough to break down UJT 27, arm SCR 32 is fired to operate solenoid 30. The SCR is turned off at the end of a desired control function by manual switch 33, and this also turns on a switch 41 to complete the discharge of C13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4228773A GB1449243A (en) | 1973-09-07 | 1973-09-07 | Electric timer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4228773A GB1449243A (en) | 1973-09-07 | 1973-09-07 | Electric timer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1449243A true GB1449243A (en) | 1976-09-15 |
Family
ID=10423763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4228773A Expired GB1449243A (en) | 1973-09-07 | 1973-09-07 | Electric timer |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1449243A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE31145E (en) | 1978-12-11 | 1983-02-08 | Honeywell Inc. | Interruptable signal generator |
| USRE31551E (en) * | 1978-12-11 | 1984-04-10 | Honeywell Inc. | Digital delay generator |
| US9287770B1 (en) | 2014-09-04 | 2016-03-15 | Martin Kanner | Analog timer circuit with time constant multiplication effect |
| US9631838B2 (en) | 2015-02-04 | 2017-04-25 | Martin Kanner | Boiler control comprising analog up/down timer circuit for generating variable threshold signal |
-
1973
- 1973-09-07 GB GB4228773A patent/GB1449243A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE31145E (en) | 1978-12-11 | 1983-02-08 | Honeywell Inc. | Interruptable signal generator |
| USRE31551E (en) * | 1978-12-11 | 1984-04-10 | Honeywell Inc. | Digital delay generator |
| US9287770B1 (en) | 2014-09-04 | 2016-03-15 | Martin Kanner | Analog timer circuit with time constant multiplication effect |
| US9631838B2 (en) | 2015-02-04 | 2017-04-25 | Martin Kanner | Boiler control comprising analog up/down timer circuit for generating variable threshold signal |
| US10247426B2 (en) | 2015-02-04 | 2019-04-02 | Martin Kanner | Boiler control comprising analog up/down timer circuit for generating variable threshold signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |